Hello christianz,Thank you for your help, but i don't have the node realflow like you !!!I'm using "rfconnect-maya-win-2015.0.0.7.exe", and i have activated "MentalRay 2015.0 - 3.12.1.18", but nothing !!!!Thx.

An answer from NEXTLIMIT : Unfortunately, the melt material disappeared from maya long time ago and now you need to make a melt material by using rfrk which is also installed with RFConnect plugin. Sorry for inconveniences.